Create issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug Report
+about: Oh no, it's a bug. Let's squash it!
+title: ''
+labels: type/bug, untriaged
+assignees: ''
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**How to Reproduce**
+If applicable, a minimal code example in order to replicate the bug.

.github/ISSUE_TEMPLATE/doc-improvement.md

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+---
+name: Documentation improvement
+about: You have a suggestion for the documentation?
+title: ''
+labels: type/docs, untriaged
+assignees: ''
+
+---
+
+**What you want to see changed**
+Write here what you think is missing.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature Request
+about: Have a suggestion?
+title: ''
+labels: untriaged
+assignees: ''
+---
+
+**The shortcoming you see**
+A short description of what the underlying issue is.
+
+**The improvement**
+How you think this shortcoming can be fixed.